Technique of in-Advance Detection of Aquiferous Structures in the Front of Excavation Working Face by Direct Current Electric Method

The paper, using DC electric triple source to carry out measurement in underground coal mines, put forward a method to infer hidden aquiferous structures in the front of excavation working face. From response of vertical interface of homogenous full space, the relationship between the characteristics of apparent resistivity gradient curves and the distance of the vertical interface was studied. The measured data were corrected by value comparison method and intersected according to spatial geometric relation. The inferred results are shown as pseudo-geological section. Examples of application of the method in successful forecast of old workings in the front of excavation working face were given. The practice demonstrated that the method is efficient.